Re: [CAD_CAM_EDM_DRO] Re: Windows Real-time

Alan:
Basically I adjust the RTC to 8192 interrupts per second, then I Pulse
the pins at a calculated time. If the pulse should occur within the 122 us
granularity I wait until then to pulse the port. All masking, pulseing,
status
checks and control outputs are done at the same time, so
the faster the computer, the more accurate the timing.
I just uploaded a new version, (I forgot to set a bit), so
give it a shot.

ARt

----- Original Message -----
From: "Alan Marconett KM6VV" <KM6VV@...>
To: <CAD_CAM_EDM_DRO@egroups.com>
Sent: Tuesday, November 28, 2000 1:12 PM
Subject: [CAD_CAM_EDM_DRO] Re: Windows Real-time


> Art,
>
> Are you just speeding up the 8254 timer chip, and then calling the
> "normal" INT 8 (IRQ 0) timer interrupt code every 500 times? I was
> trying 1ms and .1ms rates under DOS, but now I think my 33Mhz '386 may
> have been too slow to allow good results. Do you bump a software
> counter in the new interrupt code, or directly update the parallel port
> registers? or something else?
>
> (14318180.0/12.0)/65536.0 = 18.2065 (54.9 ms normal)
> (14318180.0/12.0)/1190.0 = 1002.67; ( 0.9977 ms)
> (14318180.0/12.0)/119.0 = 10023.24; ( 0.0998 ms)
>
> (14318180.0/12.0)/145.0 = 8228.84; ( 0.000122 ms) ???
> (14318180.0/12.0)/146.0 = 8172.77; ( 0.000122 ms) ???
>
> thanks,
>
> Alan KM6VV
>
>
> Art Fenerty wrote:
> >
> > Phil:
> >
> > I am using int8 with 8192 pulses/sec from the clock chip. The VXD is
> > about half & half asm and c++. It might
> > be that the k6 cannot allow the clock to interrupt at that rate. Thanks
for
> > the test though, it gives me something to
> > focus on. Although I use the RTC I also use the TSC for
> > subtiming inside the interrupt.
> >
> > Art
>
> <snip>
>
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